Please help me with the un answers questions (pre algebra)

Jack lives on a farm and has a large backyard. the area of his rectangular backyard is of a square mile. if the width of the yard is of a mile, what fraction of a mile is the length of the rectangular backyard?

How do businesses a country's economy? a. by investing in goods and services b. by increasing the unemployment rate c. by making profits

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?